Lewis & Short

părentālis, e, adj. [2. parens],

  1. I. of or belonging to parents, parental: umbrae, of my parents, Ov. Tr. 4, 10, 87.
  2. II. In partic., of or belonging to the festival in honor of dead parents or relatives: dies, the day of the festival in honor of the dead, Ov. F. 2, 548: mos, i. e. the annually repeated combat of the birds which rose from Memnon’s funeral pile, and which were therefore regarded as his children, id. M. 13, 619 (cf. id. Am. 1, 13, 4).
    1. B. Subst.: părentālĭa, ĭum, n.
      1. 1. A festival in honor of dead relations: ut parentalia cum supplicationibus miscerentur, Cic. Phil. 1, 6, 13; Inscr. Orell. 3927; 4084.
        Gen.: PARENTALIORVM, Inscr. Orell. 3999.
      2. 2. The title of a work by Ausonius.